From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754180Ab1KLFpi (ORCPT ); Sat, 12 Nov 2011 00:45:38 -0500 Received: from mga03.intel.com ([143.182.124.21]:34136 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751502Ab1KLFnv (ORCPT ); Sat, 12 Nov 2011 00:43:51 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.69,498,1315206000"; d="scan'208";a="73897226" From: "Fenghua Yu" To: "Thomas Gleixner" , "H Peter Anvin" , "Ingo Molnar" , "Linus Torvalds" , "Andrew Morton" , "Tony Luck" , "Arjan van de Ven" , "Suresh B Siddha" , "Len Brown" , "Randy Dunlap" , "Srivatsa S. Bhat" , Konrad Rzeszutek Wilk , Peter Zijlstra Cc: "linux-kernel" , "linux-pm" , "x86" , "Fenghua Yu" Subject: [PATCH v4 3/7] x86/mtrr/main.c: Ask the first online CPU to save mtrr Date: Fri, 11 Nov 2011 21:26:28 -0800 Message-Id: <1321075592-31600-4-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 1.7.2 In-Reply-To: <1321075592-31600-1-git-send-email-fenghua.yu@intel.com> References: <1321075592-31600-1-git-send-email-fenghua.yu@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Fenghua Yu Ask the first online CPU to save mtrr instead of asking BSP. BSP could be offline when mtrr_save_state() is called. Signed-off-by: Fenghua Yu --- arch/x86/kernel/cpu/mtrr/main.c | 9 +++++++-- 1 files changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c index 6b96110..e4c1a41 100644 --- a/arch/x86/kernel/cpu/mtrr/main.c +++ b/arch/x86/kernel/cpu/mtrr/main.c @@ -695,11 +695,16 @@ void mtrr_ap_init(void) } /** - * Save current fixed-range MTRR state of the BSP + * Save current fixed-range MTRR state of the first cpu in cpu_online_mask. */ void mtrr_save_state(void) { - smp_call_function_single(0, mtrr_save_fixed_ranges, NULL, 1); + int first_cpu; + + get_online_cpus(); + first_cpu = cpumask_first(cpu_online_mask); + smp_call_function_single(first_cpu, mtrr_save_fixed_ranges, NULL, 1); + put_online_cpus(); } void set_mtrr_aps_delayed_init(void) -- 1.6.0.3